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Note 4 - Short-Term Investments (Details) - Short-Term Investments (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 28, 2014 | Dec. 29, 2013
Note 4 - Short-Term Investments (Details) - Short-Term Investments [Line Items] |  |
Amortized Cost | $ 47,329 | $ 49,099
Fair Value | 47,327 | 49,099
Unrealized Gain (Loss) | (2) | 0
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |
Note 4 - Short-Term Investments (Details) - Short-Term Investments [Line Items] |  |
Amortized Cost | 33,962 | 21,986
Fair Value | 33,969 | 21,993
Unrealized Gain (Loss) | 7 | 7
Corporate Bond Securities [Member] |  |
Note 4 - Short-Term Investments (Details) - Short-Term Investments [Line Items] |  |
Amortized Cost | 13,127 | 27,113
Fair Value | 13,118 | 27,106
Unrealized Gain (Loss) | (9) | (7)
Certificates of Deposit [Member] |  |
Note 4 - Short-Term Investments (Details) - Short-Term Investments [Line Items] |  |
Amortized Cost | 240 |
Fair Value | $ 240 |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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